Improvement in combination-square



, aan

,para naar.

Letters Patent No. 94,867, dated September .pl A

y A A IMPROVEMENT 1N coMBrNATroN-SQUARE.

'e The Schedule referred to in these Letters Patent and making part of the same.

To all who-m it may concern d Be it known that 1 H. N. BURR, of Mount Gilead, 1n the county of Morrow, and State of Ohio, have invented a new and useful tool or instrument, which I `denominate a` Combination-Square; and I do `hereby declare `the following to be a full andcorrect description of the same, reference being had to the accom-` panying drawings,l in which-m Figure l is a top view ofthe square complete.

`Figure 2 is a side elevation ofthesame.

, Figures 3, 4, 5;. and 6, details.

rllhe same letter indicates the same part wherever itocours.

The object oi' this invention is to provide atool for circular, bevelled, and' other work, adapted for. the `use of machinists, wheelwrights, millwrights, and pattern-makers, and applicable to a variety of useful purposes inthe mechanic arts.

The invention consists in the peculiar construction of a square, provided with numerous graduated adjustments which adapt it for use on surfaces in different planes, and at various angles with eachother, and yfor laying ont and spacing circular, bevelled, and other work in a convenient, rapid, and accurate manner, all as hereinafter more particularly described. 4

To enable others to make-and use my new and improved square, I will proceed to describe its construction and operation.

In the drawingsj A marks a rectangular frame, the two sides of n which are united by the arbor C.

'Ihe frame has two adjustable feet, E E, which are` Y, fixed at any desiredangle with it by means of the setscrews G H.v A

Each of these feet has au index, e, at its apex, as shown ing. 2 which moves over a graduated arc on the frame, enabling theffeet to be set in advance at any given angle. j

On the arbor C is placed` the head B, so as to slide A longitudinally on the arbor, and also to rotate on it as au axis.

It is` fixed to the arbor at any desired angle to the frame .by means of the set-screw G, figs. 2 and 6, which passes up through its lower end and abuts against the surface of the arbor.

The. top of this head B is acircularlange, graduated as shown in fig. l. y

0n the flange Vis placed thel blade D of the square, which is held in place by means of 'clamp-screw F,

.which enables it to beadjusted at any required angle with the head of the square.

An index, (l, on the rear of theI blade D, facilitates this adjustment.

The blade D is provided with ay sliding-scale, J.

The spacing-arm K`is` a dat piece of metal of the form shown in iig. 3; y i f The angle-arm L is' of the .form shown in iig. 4,

i having-its inner edges turned 11p -at right angles to its surface,pas shown in Iig. 5, which presents it in edge vie W.

These arms are sometimes placed on the screw F, between the blade D and the flange of the head B, and are clamped in any required position by the screw The office of arm K is to aid in dividing a surface into equal spaces by lines at any desired 'distance apart. 4' i l Arm L is intended to receive and hold objects too small to be received and held by the feet E E.

The application of the instrument to various classes of work will be at once apparent to the practical'mechanic. l

lIt can'be used'as an ordinary T-square, by adjusting the blade D at right angles to the arbor O.

The blade D can be setto any bevelIby loosening i the clamp-screw F, and placing the index d at. the

l.proper point ou the graduated are ofthe flange of Spacing` can be conveniently and rapidly accomplished by setting the arm K at the distance 'from the edge of the blade D it is desired'to place the lines apart. Then, having drawn a line along the' edge ofthe blade, retract the blade until the point of arm K touches the line so drawn. The edge of the blade will then be in the proper position for the next "spacing line.

Wheels or other articles too small to be` embraced by the feet E E will be held by the angle-arm L, as before stated, while the required work is performed.

The feet E E can be adjusted tosurfaces ou planes at any angle to the plane of the square frame, and theblade D can, at the same timeVbe adjusted to another plane, distinct from those of the frame and of the feet.

The maximum lateral'inclin'atiou of the blade lD to the arbor C will be obtained by bringing the periphery of the flange' of head B in Contact withone or other of the sides of frame A, by sliding the head B on the arbor O, to the side preferred.

Having thus ihlly'described my invention, W' hat I claim, and desire to secure by Letters Patent is- Y l. 'Ihecombination of the frame Aarbor C, head B, and blade yD, in the manner and for the purposes described.

2. The combination o f the frameA and feet E E, in the manner and for the purpose set forth.

3. The spacing-arm K, arranged for conjoint operation with the blade D, in-the manner'and'for thepurpose speied.

4. The angle-arm L, iu combination with the instrument constructed as described, for the purpose stated. 1

The above specification of said invention signed and witnessed at Mount Gilead, this 20th day of May,vA. D. 1869.

H. N. BURR. Witnesses:

Geenen D.. Onoss, THoMAs PATTERsoN. 

